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(No Model.) 2 Sheets-Sheet I.

J. L. WELSH. l SAFETY DEVICE POR ELEWATORS` No. 593,260. Patented Nov. 9, 1897.

WITNESSES (No Model.) 2 Sheets-Sheet 2. J. L. WELSH. SAFETY DEVIGE FOR ELEVATORS.

No'. 593,260. Patented Nov. 9, 1897.

INVENTOR MTN ESSES UNITED STATES PATENT @ri-uen..

JABEZ L. lVELSII', OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF TlVO- THIRDS TO WILLIAINI P. THOMPSON AND JOIIN S. L. ALEXANDER, OF

SAME PLACE.

SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 593,260, dated November 9, 1897.

Application filed April l, 1896. Serial No. 585,775. (No model.) I

started when the door of the car is opened,V

the construction and operation being hereinafter described.

Figure l represents a longitudinal section of the portion of the safety device for an elevator embodying my invention. resents a side elevation thereof, together with a partial side elevation and partial vertical section of portion of the apparatus of an elevator to which my invention is applicable. Fig. 3 represents an elevation of the door and mechanism thereon for operating the rope, the door being closed. p elevation of the door, (partly broken away,) showing the same in open position.

Similar letters of reference indicate corresponding parts in the several figures.

In the drawings, A designates a casing having diaphragms with openin gs forming ports B in the end thereof.

lVithin the casing is the valve C, which is formed of slats or bars suitably connected and spaced, forming ports D, the same being adapted to move in said casing parallel with the diaphragms AX, whereby the ports B and D may be placed in and out of communication.

The interior of the casing is provided with shoulders or stops A' for limiting the motions of the valve while being opened or closed.

Connected with the opposite ends 'of the casing are the pipes E and F, the pipe E leading from the pressure-tank and the pipe F leading to the cylinder F of the elevating apparatus, which cylinder is ofthe usual construction.

Connected with opposite sides of the casing A-in the present case the top and bottom-- 5o are pipes G and I-I, both of which lead from Fig. 2 rep- Fig. et' represents an the pressure-tank, and each is provided with valves .I K, which are operated by suitable mechanism from the elevator-shaft door by the opening and closing of the latter, said mechanism in the present case consisting of the shackle L', which is pivotally connected with the wall of the elevator-Well and having rollers `P mounted thereon, freely inclosing the rope N, as seen in Fig. 3, in which case the door is closed and the rope is bent. To the rope is attached the bell-crank lever Q, which is suitably mounted adjacent to the pipe E and has attached to its other limb the bar R, which is pivoted to suitable stems on the plugs of the valves J K. The bell-crank lever vQ has a weight on one of the limbs thereof, so as to retain the valves .I and Kin the position shown in Fig. l, the elevatorthen being inoperative, as will be hereinafter more fully explained. Vhen, however, the door is closed, which is effected in the present case by the motion of the same to the right, the shackle L' forms a bend in the rope, thus raising the latter and operating the bell-crank lever Q, whereby motion is imparted to the bar E and the plugs of the valves J K, so as to turn the latter the reverse of that shown inFig. l, the efl'ect of which is the shifting of the valve O to permit the passage of water therethrough and the operation of the elevator, as will be hereinafter more fully described. It will now be seen that when the door is opened the valve K is opened and the valve J is closed. The water now enters the casing A through the pipe II and raises or moves the valve C, thus closing the latter as its ports are placed out of communication wi th the ports B. As a result the Water cannot flow through the casing to the cylinder, whereby operation of the car is prevented. Vhen, however, the door is closed, the valve K is closed and the Vvalve J is opened, whereby Water enters the casing through the pipe G and lowers or moves the valve C, thus opening the latter as its ports are placed into com- 9 5 munication With the ports B. As aresult the water iiows into the casing through the pipe E and from the same through the pipe F, and so reaches the cylinder.

The valves .l and K are what are known as ICO three-Way and provided With branches I.- M, so that When either valve is closed-in the present case the valve J-the Waste or expended Water may return from the casing through the pipe G and said valve J and be directed from the latter to the place of supply or elsewhere by the branch L, as shown by the arrows 2.

The supply-pipe of the elevator-cylinder is connected with the pressure-tank T by the pipe U, said tank having the pump V attached to it, the said tank being in communication by the suction-pipe V with the tank W, which has connected with it the returnpipe X, leading from the discharge-pipe Y of the elevator-cylinder. The tank W has also the feed-pipe Lattached thereto, as is usual in such cases.

I disclaim the combination of an elevatorcar and a door with means for controlling the power operating mechanism of said car by Huid-pressure by the opening and closing of said door, and I also disclaim the combination of a hydraulic main cylinder, means for stopping and allowing the oW of Water that causes the movement of the piston of the main cylinder, landing-doors, and mechanism operated by the opening and closing of said landing-doors for causing the above-mentioned means to stop the oW of Water when any one of the doors is open and allow the flow when all of the doors are closed; but

"What I do claim as my invention, and desire to secure by Letters Patent, is-

l. In a safety device for an elevator, the door of the elevator-shaft, a casing provided With ports, a valve in said casing adapted to be placed into and out of communication with said ports, pipes connected With said casing leading respectively from a pressure-tank and to the cylinder of an elevating apparatus on opposite sides of said valve, and pipes connected With the said casing and leading to said pressure-tank and mechanism for alternately opening and closing valves in said last-mentioned pipes, said mechanism being adapted to be operated by the opening and closing of said door of the elevator-shaft.

2. In a safety device for elevators, a casing With inlet and outlet ports, diaphragms in said casing having ports, a sliding valve with ports registering with the ports in said diaphragms, pipes leading from a pressure-tank to opposite sides of said valve, and provided with valves, and mechanism for opening and closing said pipe-valves alternately.

3. In elevating apparatus a casing having inlet and outlet ports on opposite sides thereof, with a valve controlling said ports, pipes leading from a power-supply for alternately operating said valve, valves in said pipes, mechanism for alternately opening and closing the same, and a movable door for actuating saidopening and closing mechanism.

JABEZ L. VELSH.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. JENNINGS. 

